I need some help regarding the paternity of my baby. I am currently 13 weeks and having a lot of anxiety about this. When on a break with my boyfriend, I had sex with someone else on 14th July (he did not ejaculate inside me). My period then came as normal (well, 2 days later) on 11 August and was pretty heavy. I then go back with my boyfriend and had sex with him throughout August. I then missed my period which was due on 10th September and took a pregnancy test which came out positive. I had an early scan on 9th October which dated me at 8+1 giving me a due date of 20th May. I then had another scan at 11+1 and 12+1 all giving me a due date of 20 May. Using online conception calculators, I ovulated on 27 August (had sex with my boyfriend on 24, 25 and 26 August) so all the dates add up. I suffer with OCD so I am having all these irrational thoughts that all of the ultrasounds could be wrong and I could be 4 weeks further ahead than the ultrasounds have told me. When I rationalise I know it's impossible for the baby to be the other man but as a suffer of OCD it feels very real.
I guess I'm just looking for advice and reassurance.
Thanks so much.